Message9056

Much as we saw with #1631, java.util.List objects do not have all the list methods, so they do not duck type properly as Python list objects (or more properly collections.Sequence):

$ jython27
>>> from java.util import ArrayList
>>> x = ArrayList()
>>> x.append("foo")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'java.util.ArrayList' object has no attribute 'append'

Note that we actually make this guarantee, but don't fulfill it:
https://hg.python.org/jython/rev/9fef5da411e5

>>> from collections import Sequence
>>> isinstance(x, Sequence)
True

Fix for beta 4. Use list_tests support library (used by test_list) to verify ops. Also looks at comprehensive support for set.